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| PartNumber | W78E051B40FL | W78E051B40DL | W78E051B40PL |
| Description | IC MCU 8BIT 4KB FLASH 44QFP | IC MCU 8BIT 4KB FLASH 40DIP | IC MCU 8BIT 4KB FLASH 44PLCC |
| Manufacturer | Nuvoton Technology Corporation of America | Nuvoton Technology Corporation of America | Nuvoton Technology Corporation of America |
| Product Category | Embedded - Microcontrollers | Embedded - Microcontrollers | Embedded - Microcontrollers |
| Series | W78 | W78 | W78 |
| Packaging | Tray | Tube | Tube |
| Package Case | 44-BQFP | 40-DIP | 44-LCC (J-Lead) |
| Operating Temperature | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) |
| Supplier Device Package | * | * | * |
| Number of I O | 36 | 32 | 36 |
| Speed | 40MHz | 40MHz | 40MHz |
| EEPROM Size | - | - | - |
| Core Processor | 8051 | 8051 | 8051 |
| RAM Size | 128 x 8 | 128 x 8 | 128 x 8 |
| Program Memory Type | FLASH | FLASH | FLASH |
| Peripherals | POR, WDT | POR, WDT | POR, WDT |
| Connectivity | EBI/EMI, UART/USART | EBI/EMI, UART/USART | EBI/EMI, UART/USART |
| Voltage Supply Vcc Vdd | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V |
| Core Size | 8-Bit | 8-Bit | 8-Bit |
| Program Memory Size | 4KB (4K x 8) | 4KB (4K x 8) | 4KB (4K x 8) |
| Data Converters | - | - | - |
| Oscillator Type | External | External | External |